title: Phenology and density of balsam twig aphid, Mindarus abietinus Koch (Homoptera: Aphididae) in relation to bud break, shoot damage, and value of fir Christmas trees.
mesh_terms: D028202:Abies / Q000254:growth & development*; D000383:Agriculture / Q000191:economics; D000818:Animals; D001042:Aphids / Q000254:growth & development*; D006693:Holidays; D007306:Insecticides / Q000191:economics; D010935:Plant Diseases; D011156:Population Density
chemical_list: D007306:Insecticides